ok this should be an easy one
just hooked up a Quad 33 +405
and there is something crossed
the left and right channels are swapped and the balance is only centered when the control is all the way to the left, which turns down the left speaker.

I am guessing there is a pot controling the balance that is shot or was improperly repaired
anyone have an answer?

and when i press the left mono btn it turns off the left
right turns off right
and yes the speakers are hooked up correctly
unless of course the brits have there lefts and rights backwards with stereos like they do driving
i was thinking before that i was possible that the wires were crossed in the din from the pre to power
but that doesn't explain why the balance control has to be all the way left to turn down the left speaker to match the right

I took the 33 to work today along with the 4pin output din so i could make use of the nice meter and iron there.

and yes it had been worked on by monkeys. the L and R lines had been swapped on one end of the output cable as i first thought and the pot for the balance was not centered. It went .25-1.25 on the left and 0.0 to 1 on the right.

This made me rather happy as it was a 10 min fix with no cost instead of the start of a search for new pot or worse.

I was absolutly amazed at how clean it was after opening it for the first time. Not a speck of dust inside, looked like it was new.
For something thats as old as I am i was very impressed as most electronics today look like crap after about 6 months.